可以.
I doubt if/ whether he is a teacher in our school.我怀疑他是不是我们学校的老师.
只有whether...not这时候不能用if.
I wonder whether he is a teacher in our school or not.
不懂问我,希望对您有帮助,南无地藏菩萨!
在if whether 连接的宾语从句中 有doubt可以用if吗
可以.
I doubt if/ whether he is a teacher in our school.我怀疑他是不是我们学校的老师.
只有whether...not这时候不能用if.
I wonder whether he is a teacher in our school or not.
不懂问我,希望对您有帮助,南无地藏菩萨!